"... It is my linguistics based theory that the ancient Thracians and
Dacians were Balts. (See my LITUANUS articles, “Balts and Carpathians”
(1997) 43:2. 22-30; “South Baltic” (1996) 42:2. 60-70; and “Dacian and
Thracian as southern Baltoidic” (1992) 38:2. 24-30.) Evidence for this
is the following.

1. The 373 Dacian-Thracian-Baltic roots discussed
by Duridanov.
2. The fitting of special Dacian and Thracian features
(which I identified from Duridanov’s listings) into Baltic isogloss patterns
so that I identified Dacian and Thracian as southeast Baltic. South
Baltic because, like Old Prussian, they keep unchanged the diphthongs ei,
ai,
en,
an
(north Baltic Lithuanian and Latvian show varying percentages of ei,
ai
to ie, and en,
an to ,
(to , )
in Lithuanian, to ie, uo in Latvian). East Baltic
because the Dacian word uvete
(now in Rumanian spelled juvete) has ,
not z as in west Baltic, and the Thracian word pušis (the Latin-Greek
transcription shows pousis which, I believe, reflects -š-.)
with zero grade puš- as in Lithuanian pušìs rather
than with e-grade *peuš- as in Prussian peus.
Zero grade in this word is east Baltic, e-grade here is west Baltic,
while the other word for “pine, evergreen”, preid
(Prussian and Dacian), priede (Latvian), is marginal in Lithuanian
matched by no *peus- in Latvian.

So Dacian and Thracian are south Baltic like Prussian and east
Baltic like Lithuanian (but not like Latvian which is west Baltic
like Prussian).

In LITUANUS (1992) I say that Dacians brought (as slaves) Carpathians
south who became Messapians and Illyrians and from these, Albanians, and
north who became Slavs. My LITUANUS (1993) article, “Slavic, a balticized
Albanian”, 39:2. 78-83, also discusses linguistic relations between Baltic
and Slavic.

The LITUANUS (1997) article also describes the non-Dacian Rumanians
as a Carpathian people who quickly romanized linguistically to gain Roman
support against their Baltic masters (the Dacians)."

In a second letter from March 2, 1999, Dr. Mayer added:

... I consider the Messapian not linkable to the Balts, but to
the Slavs, Albanians, Illyrians, and Non-Dacian autochtonous Rumanians
(=not Romans), that is, Caprathian peoples, linguistically.